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Utilizing the TBM, Big Tex for the Dallas Mill Creek drainage relief tunnel

FIG. 1 Dallas Mill Creek drainage tunnel alignment. The Dallas Mill Creek Drainage Relief Tunnel is an 8.4 km (5 mile) tunnel that will provide 100-year flood protection for impacted neighborhoods in the east Dallas area. “Big Tex” is a main beam gripper tunnel boring machine (TBM) capable of changing diameters in mid-tunnel to excavate 2.83 km (9,290 ft) of 11.45 m (37.58 ft) diameter tunnel and 5.21 km (17,095 LF) of 9.93 m (32.58 ft) diameter tunnel. Construction began in April 2018 and is anticipated to be completed in 2024. This article will discuss the challenges and lessons learned during assembly, reassembly, startup and mining with Big Tex. History and background The city of Dallas has a long history of severe flooding over the years that has resulted in property damage, in...

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